Elastic-fluid turbine



June 5, 1928. O. JUNGGREN ELAS'IYIG'FLUID TURBINE Filed May 1927Inventor": Qsccrr" Jumggre'n,

His Attorrga.

Patented June 5, 1928.

UNITED STATES PATENT OSCAR ."runeennn, COMPANY, or

OF SC I-IENECTADY. NEW YORK, ASSIGNOR TO GENERAL ELECTRIC SCHENECTADY,NEW YORK, A CORPORATION OF NEW YORK.

ELASTIC-FLUID TURBINE.

Application filed May 7,

The present invention relates to elasticfiuid turbines of the large'rtype demanded by present-day power requirements. More particularly thepresent invention relates to the exhaust end structures of suchturbines, which involve exhaust casings of extremely large size andassociated parts of similar size intergral with or attached to thecasings. In large casings and parts of this character, considerablecoring or chambered construe-- tion in employed to reduce weight,particularl ther eof. While this construction'is both desirable andnecessary in providing a satisfactory design, it adds to theproblem ofproviding for the uniform heating of the large mass of material in theexhaust end structure; r.

The corded or chambered portions of the mass tend to remain cool longafter the main body has become hot. In a form of turbine, for example,in which large cored supporting feet for the exhaust casing and a largecored bearing pedestal adjacent the casing are provided, the feet andpedestal remain comparatively cool long after the casing has become hot.As a result there is consider able strain in the casing and between thehot and the cooler parts and in many cases sufficient deformation of thecasing to throw the diaphragms out of line and to open cas ing joints atcertain places.

It is the object of the present invention therefore to provide animproved exhaust casing arrangement for large elastic-fluid turbineswhich permits a cored or chambered construction in and adjacent to theexhaust casing without any of the accompanying disadvantages abovementioned.

As an example of a specific embodiment of the invention, the exhaust endstructure of a common form of elastic-fluid turbine is illustrated inthe accompanying drawing, and for a consideration of what is believed tobe novel and the invention, attention is directed thereto, and to theaccompanying description and appended claims.

In the drawing, Fig. 1 is a plan view of an elastic-fluid turbineexhaust end structure embodying the invention; Fig. 2 is a sectionalview ofthe same taken on line 2-2, Fig. 1, and Fig. 3 is a detail viewin section taken on line 3-3, Fig. 1.

Referring to the drawing, 5 is the foundation on which the exhaustcasing 6 rests.

in the base and supporting portions 1927. Serial No. 189,525.

ing and are shown as being integral with the casing. The bearingpedestal may be, and often is, separable from the casing; In any caseits location is substantially as shown. In this location it is, togetherwith the cored supporting feet for the casing and other cored portionsthereof, subjected to heating from the casingr 1 As pointed outhereinbefore such cored or chambered parts in and adjacent the cars ingare the, source of strains and distortion. Such parts are, however,desirable and neces sary in providing a well designed casingconstruction of the larger type. In accordance with the invention,however, the apparent disadvantage of location of such parts is turnedto advantage as will be seen from the following. I

Since casing structures and like parts are castings, all cored orchambered parts must necessarily have an opening for removing the corematerial. In large turbines the cored parts adjacent the casing may thenbe cored to open into the latter. The opening serves to place eachchamber from which the core was removed in communication with theinterior of casing from which it then receives heating fluid and offersno greater impedance to heat flow than the remainder of the casing.Hence the difiiculty in the way of using cored or chambered parts in theexhaust end structure is overcome as the same may in accordance with theinvention be used as required and may with advantage be placed adjacentor in the casing. The core removal opening then serves to form theheating connection automatically. Such connection may, however, be madeby other means where the cored or chambered part is sufiicientlyseparated or distant from the exhaust casing to prevent coring directlyinto it.

' In the present example the cored or. cham- (1h am bered parts are solocated that direct connection may be made with the exhaust casing bythe core openings which are inclicated at 13 and 14:. With thearrangement shown the core openings are made directly in the walls ofthe exhaust hood. Such openings may be provided in the walls in anyother suitable manner. With the arrangement shown, communication withthe exhaust casing interior is established with out additional workafter casting.

It has been found that by permitting heating fluid to circulate in thechambered parts connected with the exhaust hood the casing heats up andcools down uniformly, thereby avoiding great strains in the metal andhelping to maintain alignment in the working parts of the turbine.

The simple cored construction shown and described is only. by way ofexample as representing any cored or otherwise chambered exhaust endstructure which in accordance with good design may be desired.

It will be seen that with the construction in accordance with theinvention the location of cored or chambered parts close to or in theexhaust casing is entirely permissible and advantageous since by turningthe core openings onto the exhaust casing instead of elsewhere a directheating connection is made with said casing.

What I claim as new and desire to secure by Letters Patent "01 theUnited States, is

1. In an exhaust end structure for an elastic-fluid turbine, a castexhaust casing, and cast walls integral with said casing providingchambers adjacent the casing wall, said casing wall being provided withcore removal openings for said chambers which provide directcommunication between the latter and the interior of theexhaust casing.

2. In a casting for an exhaust end-structure for an elastic-fluidturbine, integral cast walls forming an exhaust casing and coredchambers adjacent thereto, one of said walls being common to the coredchambers and to the exhaust casing, said wall having core removalopenings therethrough--providing direct communication between theinterior of the exhaust casing and the cored chambers.

3. In an elastic-fluid turbine, the combination with a casing throughwhich elastic fluid flows, of a cored chambered structure integral withsaid casing, one wall of said structure being formed by the casing andthe latter having core removal openings pro-' viding directcommunication between the interior thereof and the interior of thechambered structure, whereby elastic fluid is supplied from the casingto the interior of said chambered structure.

In witness whereof, I have hereunto set my hand this 5th day of May,1927. I

OSCAR JUNGGRENQ

